Trayvon Martin's brother Jahvaris Fulton steps down after taking the stand during the George Zimmerman trial in Seminole circuit court, July 5, 2013 in Sanford, Florida. Zimmerman is charged with second-degree murder for the February 2012 shooting death of 17-year-old Trayvon Martin.The brother of Trayvon Martin, whose shooting death by George Zimmerman gained international attention over the past year, is currently serving as an intern for Rep. Frederica Wilson, D-Fla., her office confirmed to NBC News. A Florida jury found Zimmerman not guilty of a crime in Martin’s death on July 13. Martin’s brother Jahvaris Fulton attends Florida International University...